drm/amd/display: Disable boot optimization for DCN401

[Why]
DCN401 currently has an issue re-enabling when pipe splitting is enabled,
while the root cause is being investigated we can make sure everything is
being reset as a workaround, by disabling boot optimization.

[How]
 - use enable_accelerated_mode instead of init_pipes to fully reset asic

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Joshua Aberback <joshua.aberback@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c

@@ -304,7 +304,14 @@ void dcn401_init_hw(struct dc *dc)
 	 * everything down.
 	 */
 	if (dcb->funcs->is_accelerated_mode(dcb) || !dc->config.seamless_boot_edp_requested) {
-		hws->funcs.init_pipes(dc, dc->current_state);
+		/* Disable boot optimizations means power down everything including PHY, DIG,
+		 * and OTG (i.e. the boot is not optimized because we do a full power down).
+		 */
+		if (dc->hwss.enable_accelerated_mode && dc->debug.disable_boot_optimizations)
+			dc->hwss.enable_accelerated_mode(dc, dc->current_state);
+		else
+			hws->funcs.init_pipes(dc, dc->current_state);
+
 		if (dc->res_pool->hubbub->funcs->allow_self_refresh_control)
 			dc->res_pool->hubbub->funcs->allow_self_refresh_control(dc->res_pool->hubbub,
 					!dc->res_pool->hubbub->ctx->dc->debug.disable_stutter);

drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c

@@ -733,6 +733,7 @@ static const struct dc_debug_options debug_defaults_drv = {
 	.force_cositing = CHROMA_COSITING_TOPLEFT + 1,
 	.disable_idle_power_optimizations = true,
 	.edp_oled_no_backlight_enable = true,
+	.disable_boot_optimizations = true,
 };
 
 static struct dce_aux *dcn401_aux_engine_create(